单词：group of orthogonal transformations
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601. kneel vi. 跪 602. label n. 标签 603. merchant n. 商人 604. mere a. 仅仅的,只不过的；纯粹的 605. nuisance n. 令人讨厌的东西（或人） 606. numerous a. 众多的,许多的 6
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